Back to Functions — Problem 2 · Task Set 35

8.F Tutor Intake — Functions: Define, Compare, and Model

This short check helps your tutor understand where to start. Answer each question without help. If you're not sure, give your best try — the goal is to find what to work on together, not to grade you.

Grade 8·13 problems·~13 min·Common Core Math - Grade 8·domain·f

Work through problems with immediate feedback

Concepts

A student claims the table below is NOT a function because the
output 10 appears more than once.

Input (x)	Output (y)
1	10
2	14
3	10
4	18

Is the student correct, and why?

No — the table IS a function. Each input has exactly one output;
two different inputs sharing the output 10 is allowed.

Yes — it is not a function because the output 10 is repeated for
inputs 1 and 3.

No — the table IS a function only because all the inputs are
different; if any output repeated it would fail.

Yes — it is not a function because the outputs are not all
different from one another.